I've never heard of performance-quest. It is something similar to Roundpoint.com, who also delivers subscription-based daily news content. Unfortunately, I don't think there is a way to convert Mobipocket .prc files to iSilo documents, other than reverse-engineering the two formats, which is probably a) way too complicated and b) not legal in most countries.
It is probably easier to visit the web page of your local paper, and see if there are ways to convert it directly to iSilo.
For instance, The Daily Herald offers RSS feeds. These could be used with a reader like Sunshine and some xslt transformation to get a mobile-friendly version. Or you could use Sitescooper to scrape the necessary info from the page.
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